Drawing frame for spinning machines



March 5, 1957 A. SCHUSSLER ETAL 2,783,505

DRAWING FRAME FOR SPINNING MACHINES Filed June 27, 1955 Fig-3 DRAWING FRAME FOR SPINNING MACHINES AlfredSchiissler, Karl-Marx-Stadt, and Erwin Schiifer,

Mittweida, Saxony, Germany, assignors to Veb Spinnereimaschinenbau Karl-Marx-Stadt, Karl-Marx-Stadt, Germany, a corporation-of Germany Application June 27, 1955, Serial No. 518,254

'5 Claims. ((31. 19-135) the top rolls themselves for which purpose these top rolls are given particularly great weight. The latter case has the disadvantage that the corresponding top rolls must be exchanged for each desired change in nipping pressure,

thus requiring inconvenient and time-consuming attendance. Besides, the carrying structure for the top rolls must be given a particular, 'spacially unfavorable design.

The exchangeable weights are disposed'laterally of'th'e drawing frame and preferably on both sides'thereof, thus occupying just those places where space is at a premium. Considerable time is required for attachment and removal of weights.

It is an object of our invention to eliminate these shortcomings and to provide a drawing frame with a top-roll weighting device that can readily and rapidly be'-'setto"any desired nipping pressure within a wide pressurerange but does not occupy space within or laterally ofthe'd'ra'wing mechanism proper.

Anotherobject is to improve such a drawing frame 'as regards the facility andspeed with which it can beset into and out of operation. More specifically, it is an object of our invention to devise the drawing frames in such a manner that a single manipulation sufiices to relieve the top rolls of weighting pressure and also to swing them upwardly away from the bottom rolls, or to return the top rolls to the drawing position and also applying the proper weighting pressure.

To attain these objects and in accordance with a'fe'ature of our invention we provide a drawing frame of the type above described, with a separate weighting lever which bears from above upon the upwardly swingable holder of the top-roll assembly and which carries a weight acting upon the holder with a selectively adjustable leverage. According to another feature of the invention, the weighting lever has a fulcrum axis located above and parallelto the pivot axis of the top-roll holder and acts upon the holder at a place between that pivot axis and the point where the holder is pivotally linked to the rest of the top 'roil msembly, the weight being slidably mounted on, and .displ-aceable along the'weighting lever. Accordirig'to still another feature the fulcrum of the weighting lever is disposed on an arm which is rotatable about the pivot axis of the top-roll holder; and the weighting lever has a pro jection or roller resting against the top-roll holder from above for transmitting weighting pressure thereto, while the fulcrum-carrying arm has a stop engageable with the holder from below for lifting the holder and thus the 2,783,505 Patented Mar. .5,

weighting leverupwardly to the inactive position;

The foregoing and more specific features of the inven tion, all set forth with particularity in the claims, annexed hereto, will be apparent from the embodiment illustrated on the drawing in which Fig. 1 shows a lateral view of a drawing frame in "the operating position,

Fig. 2 shows part of the top-roll assembly o'f'the same drawing frame also in a lateral view but on a larger scale and'partly in section.

In the illustrated drawing frame, the upper portion, comprising the entire top roll assembly, is m'ountedon apivot shaft or rod 1 which extends transverse to the drawing direction and may 'passalo'ng a large number of individual drawing frames located side by side ina row 'o'fany desired length. The pivotal mounting .of the top-roll assembly permits this assembly to be swung upwardly from the position illustrated in Fig. 1 to the open, inactive position. This is done 'with'the aid of a holder 2 whose front end is linked by a'pivot pin 3 to a guiding saddle 4 from "which a supporting saddle, 5, 5a is penduloiislysuS- pended. The supporting saddle carries two top rolls 6 and 7. Another top roll, namely the delivery roll 8, is mounted on the" guiding saddle 4. The top rolls 6, 7 and 8, when in operative position, cooperate with respective, stationarily journaled bottom rolls 6, 7, 8 to subject a textile strand S, such as a sliver or roving, to an attenuat ing draft caused by progressively higher speeds of the successive roll pairs respectively. I

'For providing between the rolls of each'pair the nipping pressure required for the drawing operation, "the abovedescribed top roll' assembly is weighted by means ofa lever 11 which carries a'slidably displaceable weight 12. The lever 11 bears from above upon the holder 2 at a point located betweenthe pivot shaft 1 and the linking pivot 3. The lever 11 is fulcrumed on a pin 10 mounted on a swing arm 9 which is seated upon the pivot shaft 1 of the machine. The lever 11 has a short'arm13 which,

during weightingperformance, bears against the holder'l preferably by means of an intermediate'roller 14 j-ournale d on the lever arm 13. The weighting lever thus has two angularly related arms '-of which the longer one extends above and along the holder 2 and carries the adjustable weight 12.

The swing arm '9 is provided with a stop 24 extending beneath the holder 2. When the upper portion of the drawing frame is to be swung upwardly into the open position, it is merely necessary for the attendant tolift the lever 11 so that this lever and the arm 9 swing about the axis of pivo't'shaft 1. The stop 24 then entrains the holder 2, thus lifting the entire top-roll assembly away from the bottom rolls. Preferably, and as shown, the swinging movement of lever 11 and of lever arm 13 relative to holder 2 are limited by a stop 15 formed by a projection of the leverarm I3. A pawl 26 is provided for latching and arresting the weighting lever and the entire truck roll assembly in the raised position.

The supporting saddle for the drawing rolls 6 and 7' is composedof two flat parts 5 and 5a connected with-each other by-screws 16. Part 5 is displaceable relative 'to part 5a in a direction parallel to that of the drawing operation. Such displacement is made possible'by the provision of elongated openings 17 and 17 in parts 5a and 5 respectively. Firmly secured to part 5a is a pin '18 with two lateral dowel fingers 19. The dowels are bring into a selected one of a number of notches 20 of the guiding saddle 4. In this manner, the carrier saddle 5, 5a is pendulously suspended from the guiding saddle and can be selectively adjusted relative to the guiding saddle in a direction parallel to the drawing direction of the frame. Two leaf springs 21 between part 5a and the guiding saddle a 3 secure the supporting saddle in position, while permitting 'a'pendulous adjustment of the supporting saddle.

For better distribution of the load of weight 12, the

holder 2 transmits pressure not only through pivot pin 3 to the guiding saddle 4 but is also in pressure-transmitting engagement with the supporting saddle 5, 5a at a point between the pivot pin 3 and the pivot shaft 1. To this end, the holder 2 is provided with an abutment 22 bearing against the top of pin 18. it will be recognized that the pressure of the weight is centrally distributed upon the top rollers and that any desired loading can readily and rapidly be adjusted by displacing the weight. Furthermore, in such a drawing frame the weight can be kept relatively small so that the weighting lever is easily manipulated for opening and closing the drawing frame.

The drawing rolls 6, 7 as well as the delivery roll 8 of the top roll assembly are mounted and journalled by means of clamping springs 23. The rollers 6, 7, 8 have a middle portion 27 of reduced diameter, and the clamping springs 23 straddle this middle portion 27 of each roller and reach sufficiently over the roller periphery at ,this point to secure a reliable journaling of the top rolls.

Aside from the advantages mentioned above, all parts .of the weighting device in a drawing frame according to invention and as illustrated are always readily accessible for inspection, adjustment or repair as they occupy space only above the drawing roll mechanism proper and do not extend downwardly between the roll pairs. No space is needed for any part of the weighting device at places horizontally beside the drawing rolls so that the individual drawing lines of a spinning machine can be located horizontally close to each other to afford a compact design of multi-line machinery.

It will be understood by those skilled in the art upon a study of this disclosure that our invention permits of various modifications as regards design details and hence may be embodied in devices other than that specifically illustrated and described, without departing from the es sential features of our invention and within the scope of the claims annexed hereto.

We claim:

1. A drawing frame for spinning machines, particularly spinning machines, comprising a group of roll pairs each pair having a bottom roll and a top roll and all rolls being parallel to each other, a pivot shaft spaced from said group in parallel relation to said rolls, a saddle assembly on which said top rolls are mounted, a holder linked to said assembly and movable about the axis of said pivot shaft for lifting said assembly and said top i'olls away from said bottom rolls, a weighting lever havinga fulcrum parallel to said pivot shaft and having a long arm and a short arm, said short arm when effective being in pressure engagement with said holder at a place ,between said pivot shaft and the point where said holder is linked to said assembly, and a weight displaceably mounted on said long arm.

' I 2. A drawing frame for spinning machines, particularly ring spinning machines, comprising a group of bottom rolls and top rolls all parallel to each other, a pivot shaft parallel to said rolls and spaced from said group of rolls, a saddle assembly on which said top rolls are mounted, a holder linked to said assembly and movable about the axis of said pivot shaft for lifting said assembly and said top rolls away from said bottom rolls, a weighting lever having a fulcrum parallel to said pivot shaftand having a long arm and a short arm angularly related to each .other, ,said fulcrum being located above said holder, said short arm when in use extending from said fulcrumdownwardly intopressure engagement with said holder at a place between said pivot shaft and the point where said holder is linked to said assembly, said long arm extending from said fulcrum generally in a direction toward said point, and a weight displaceably mounted on said long arm.

3. A drawing frame for spinning machines, comprising a group of bottom rolls and top rolls all parallel to each other, a pivot shaft parallel to said rolls and spaced from said group of rolls, an assembly on which said top rolls are mounted, said assembly comprising a holder movable about the axis of said pivot shaft, an arm mounted on said pivot shaft, a weighing lever fulcrumed on said arm and having a fulcrum axis parallel to said shaft axis and upwardly spaced therefrom, said lever having a long arm and a short arm angularly related to each other, said arm extending when in use downwardly from said fulcrum axis and having a roller engageable with said holder to transmit weighting pressure to said holder, said long arm extending from said fulcrum axis generally along and above said holder, and a weight displaceably mounted on said long arm.

4. A drawing frame for spinning machines, comprising a group of bottom rolls and top rolls all parallel to each other, a pivot shaft parallel to said rolls and spaced from said group of rolls, an assembly comprising a saddle member and a guide member and a holder, one of said top rollers being journaled on said guide member, said holder being movable about the axis of said pivot shaft and being linked with said guide member to impart pressure thereto, said saddle member having pivot means joined with said guide member for pendulously suspending said saddle member from said guide member, said pivot means being adjustable relative to said guide member in a direction parallel to the drawing direction, an arm mounted on said pivot shaft, a weighting lever fulcrumed on said arm and having a fulcrum axis parallel to said shaft axis and spaced therefrom, a weight adjustably mounted on said lever, said lever being normally in pressure-transmitting engagement with said holder.

5. A drawing frame for spinning machines, comprising a group of bottom rolls and top rolls all parallel to each other, a pivot shaft parallel to said rolls and spaced from said group of rolls, an assembly comprising a saddle member and a guide member and a holder, one of said top rollers being journaled on said guide member, said saddle member being pendulously suspended from said guide member, said holder being pivotally linked to said guide member to transmit pressure thereto and having a point of pressure engagement with said saddle member at a location near the pendulous suspension of said saddle member, an arm mounted on said pivot shaft, a weighting lever fulcrumed on said arm and having a fulcrum axis parallel to saidshaft axis and spaced therefrom, a weight adjustably mounted on said lever, said lever being normally in pressure-transmitting engagement with said holder.

References Cited in the file of this patent UNITED STATES PATENTS 1,694,510 Kluftinger Dec. 11, 1928 2,353,338 Hess July 11, 1944 2,565,228 Gwaltney et a1 Aug. 21, 1951 2,657,434 T arbox et al Nov. 3, 1953 FOREIGN PATENTS 6,125 Great Britain of 1893 828,493 Germany Jan. 17, 1952 829,717 Germany Dec. 27, 1951 

